<!DOCTYPE html>
<html>
    <head>
        <script src="../js/vue.js"></script>
        <style>
            .box{
                background: pink;
                width: 100%;
                height: 200px;
            }
            .inner{
                background: red;
                width: 100px;
                height: 50px;
                border:  2px solid white;
            }
            .border{
                border: 5px solid blue;
            }
        </style>
    </head>
    <body>
        <div id="app">
            <div v-bind:class="box1">
                我是box
                <div v-bind:class="inner1">我是inner1</div>
                <div v-bind:class="[border,inner1]">我是inner2</div>
            </div>
        </div>
        <script>
            var vm = new Vue({
                el:'#app',
                data:{
                    box1:'box',
                    inner1:'inner',
                    border:'border'
                }
            })
        </script>
    </body>
</html>